Turbo normalizing for cars?

[Daox]

This has been discussed a little bit before. IMO it can be useful, but the question is really how useful? With a small turbo system one could achieve increased torque at low rpms (less than 3000) and increase peak BSFC at those rpm. Above that, friction from the engine ends up beating out much of the benefit the turbo provides. So, your gains would be mainly be from 0 - 3000 rpm. If the turbo provides above optimal torque, ignition timing must be pulled back and you again loose efficiency. Tuning this setup would be quite the task, but I hear you guys are pretty good. It would be interesting to see the setup.

[i_am_socket]

Can't remember the last time I went over 3000 rpms...

If it's $ free to test, do it!

[Daox]

It would basically elongate the peak BSFC area to include lower rpms. So, when looking at the map below, the peak area would be extended to the left to some extent.

[aerohead]

For Diesels,load doesn't seem to matter as much as for gasoline engines,as they have no throttle,however,pumping losses in the gasoline engine are pretty much governed by load and throttle position.Since the throttle plate has a drag coefficient of of 1.11(like a sheet of plywood),the BSFC maps usually show economy peaking in the range where torque peaks,which is where charging efficiency is peaking with best volumetric efficiency and the throttle plate is well "open".In olden days,some carburetors were designed such that at cruise,the primary butterfly valves were essentially wide-open,with minimum pumping losses.Your turbo idea may have much merit.If you choose to do the project,try and get a good baseline,then do a bunch of record keeping after the mods so we can all learn from your experiences.There's been much discussion over the years about turbos/mpg,this would be a great way to get some good numbers on this topic.

[getnpsi]

saab spent millions to make 15-20hp...i would raise static compression especially on a honda engine that does great in n/a form. engine swap seems to be the tried and true thing for the honda guys with the better flowing si engines. however if all of the parts you need are free i would go for it. i think a turbo would benefit a cng converted car a great deal without having to tear it down completely.